My theme is a computer hacker creating a virtual avatar to interact with the net, much like an old sci-fi Tron approach. So, my words are some of the common MMORPG terms and the player is solving these to break into their respective systems and craft the ultimate avatar.
Easy - The Basics:
Health, Mana, Items, level, gold
Medium - The Roles
Warrior, Mage, Rogue, Archer, Cleric
Hard - The Stats
Wisdom, Dexterity, Strength, Intelligence, Charisma